Lock with safety bolt

ABSTRACT

A key-operated lock having a locking bolt or tongue having a latch position and a bolt locked position, and including a locking plug with means for holding the locking plug in either tongue-locked or tongue-free condition; the locking tongue in bolt locked position extending to a greater than normal extent to present a flat flush surface to the door jamb to prevent retraction of the tongue by means of an instrument at the front of the door.

Genakis 1 1 May 30, 1972 541 LOCK WITH SAFETY BOLT 1,092,414 4/1914Wellisch ..7o/143 x 1,199,645 9/1916 Wicks ..70/143 Invent Mlchae' Gena,948 3,314,708 4/1967 Welch ....292/336.5

wmester, Mass- 01605 386,522 7/1888 Bullard ....292/337 x [22] Filed:NW51970 2,986,919 6/1961 11611561 ..292/337 x Appl. No.: 87,147

Primary Examiner-Albert G. Craig, .lr. Attorney-Charles R. Fay

[57] ABSTRACT A key-operated lock having a locking bolt or tongue havinga latch position and a bolt locked position, and including a lockingplug with means for holding the locking plug in either tongue-locked ortongue-free condition; the locking tongue in bolt locked positionextending to a greater than normal extent to present a flat flushsurface to the door jamb to prevent retraction of the tongue by means ofan instrument at the front of the door.

2 Claims, 14 Drawing Figures PATENTEDHAY 30 m2 3,566,306 SHEET 10F 3 GALg M "02 Mixj INVENTOR. 30%. M. GENAK\ BACKGROUND OF THE INVENTION Locksof the class described which are usually referred to as door locks, havea tongue normally extending from a casing for engagement in a socket orkeeper on a frame of the closure in which the bolt is withdrawn inwardlyof the casing to a release position, and a key operated member of theoscillatable plug type accessible at either or both sides of the casingfor locking and unlocking the bolt so that it can be opened by means ofthe door handle. These locks are commonly constructed as morticed locks,although the invention is not so restricted.

These locks are commonly relatively complicated and expensive both tomanufacture and install, and in many cases it is possible to open themby means of a stiff implement merely thrust into a space between theedge of the door and the door jamb or frame because the tongue has aninclined surface so that the door can be closed without actuating thehandle as is well known.

It is the object of the present invention to provide a very simple andinexpensive lock of the kind described which has a tongue which isimpossible to retract by means of an implement thrust inbetween the doorcasing and the casing of the lock itself, i.e., the edge of the door,because a flat surface is presented, not an inclined surface.

BRIEF DESCRIPTION OF THE DRAWING plate for the lock casing FIG. 4 is apartial edge view thereof looking in the direction I of arrow 4 in FIG.3;

FIG. 5 is a partial rear view of the side showing the thumb turn cam;

FIG. 6 is a view similar to FIG. 1 showing a modification;

FIG. 7 is an adge view thereof looking in the direction of arrow 7 inFIG. 6;

FIG. 8 is a view similar to FIG. 6 but showing the lock in unlockedcondition;

FIG. 9 is a perspective view of a form of tongue or bolt;

FIG. 10 is a bottom plan view of FIG. 8;

FIG. I I is a view similar to FIG. 6 showing a further modification;

FIG. 12 is a view similar to FIG. 8;

FIG. 13 is a perspective view of the tongue of FIGS. 11 and 12; and

FIG. 14 is a perspective view of a tongue retractor.

plate of FIG. 3, and

PREFERRED EMBODIMENTS OF THE INVENTION In FIGS. 1 and 2, the lock isprovided with a case 10 having a front plate 12. The case forms anenclosure one of the side plates of which is indicated at 14 in FIG. 3and is omitted from FIGS. 1 and 2 in order to show themechanism. A doorhandle shaft fits in an opening at 16 turning an oscillating element 18provided with a pair of radial arms 20 and 22.

The arm 22 is provided with a spring-pressed ball connection 24, FIG. 2;with respect to member 18 so that if a wrench is put on the handle thesquare shaft will turn the member 18 forcing back the ball at 24 so asto fail to operate the lock by force. If desired, an opening at 25 inthe bottom 26 of the casing 10 may provide an opening for motion of arm22 in a clockwise direction therethrough, also thereby turning arm 20 ina clockwise direction to retract bolt or tongue 30.

A tongue or a bolt generally indicated at 30 is provided with achamfered head 32 which extends through an opening 34 in the front plate12. This also acts as a guide for the tongue or belt, at least at theforward end portion thereof which terminates in an enlarged shoulder 36.As shown in FIG. 1 this prevents any further extension of the tongue 30outwardly to the left. As a matter of fact there may be a pair ofshoulders 36, one at the top of the tongue and one at the bottomthereof. The tongue is spring-pressed to the left by a spring 40contained in a recess therein and operating against one end of a pin 42,the other end of which may rest against a rear wall 44 of casing 10, seeFIG. 2. The tongue or bolt has spaced ears 4! and 43 for actuation byarm 20, to move the tongue in either direction.

The opposite end of the tongue or bolt terminates in a relativelysmaller head 48 located in guideways S0, 52 so as to slide therein, andlooking for instance at FIG. 2 it will be seen that the chamfered head32 of the tongue or bolt 30 is capable of spring-resisted retractionfrom the position shown in FIG. 2 to a position wherein the extremeforward edge of the head of the tongue may be aligned with respect tothe outer surface of front plate 12 of casing 10 to open the door, as bythe handle in opening 16.

There is an oscillating plug indicated at 60 for the purpose of lockingthe tongue or bolt as in the FIG. 1 position. This plug is provided witha downwardly extending projection 62 so that when it is turned in acounterclockwise direction from the FIG. 2 free position to the FIG. 1locked position, the abutment 62 will lie behind the shoulder 63 formedin head 54, thus clearly locking the bolt or the tongue in the positionshown in FIG. 1, preventing any motion to the right and at the same timethe shoulders at 36 prevent any further motion to the left. A simplespring 64 may be utilized to hold the plug in the position shown in FIG.I and by means of the bent arm 66 thereof it can also be used to hold itin its free condition, see FIG. 2.

The plug 60 is pivoted on a pin 70 and is moved into the FIG. 1 positionby means of a cam 72, this cam being operated by a key inserted in keyslot 74 as will be clear to those skilled in the art, and it will bealso seen that the plug 60 is held in the FIG. 1 position thereby, butwhen the key is turned in a clockwise position, the cam 72 turns alsofreeing the plug 60 and at its opposite stroke causing the same to movein a clockwise direction about pivot 70, so that the handle in thesquare slot 16 may then be turned to open the door or other closure.

It is preferred that the plug 60 should also have another abutment atits opposite end for engagement with the left edge of head 48, see FIG.2, when the plug 60 is in tongue-free condition, preventing the tonguefrom moving to the left, also, a locking bolt 84 drops down behindshoulder 36, see FIG. 2, preventing the tongue or bolt 30 from movingany further to the lefi than is shown in FIG. 2, this being anintermediate position in which the chamfered portion of head 32 iseither aligned with or retracted within the aperture 34. The reason forthis is that the head of the tongue or bolt besides the chamferedportion also has a flat surface on it andwhen in the FIG. 1 positionthereof this flat surface 90 extends to the left beyond the face plate12, so that an implement thrust in between the face plate and the doorjamb cannot contact the chamfered surface on the head 32, but is engagedby the flat surface 90 and this thereby prevents the tongue from beingretracted.

The bolt 84 is operated by a pivoted member 92 having a pair of arms 94and 96, the arm 94 extending into a yoke in the plug 60, so that it willbe seen that the member 92 is moved both up and down by plug 60 as thelatter is turned by means of the key and under influence of cam 72, orby thumb turn cam 200.

There may also be utilized a spring-pressed member 101 having an end 102which may be pushed into the position shown in FIG. 1, preventing thetongue or bolt 30 from being moved exteriorly of casing 10 by any meansso that even if the lock should be picked, the pin 102 which of courseis operated from inside the door, prevents the tongue from retraction toopen the door.

Thus it is seen that the tongue or bolt 30 provides a night bolt effectwhich cannot be jimmied; the pin 102 prevents opening of the lock if thelock at 75 should be picked; and at the same time that the door isunlocked, the tongue or bolt latches the door when it is shut but it canbe retracted for opening the door by the handle in the opening 16. Thiscan also be done by projecting a finger or thumb latch through theopening at 25.

FIGS. 6, 7, and 8 show a modification of the device as shown in FIGS. 1and 2. In this case the plug 60a is turned directly by a rim cylinder at112 instead of by the cam. A lost motion connection 113 comprises aspring-pressed pin in the bolt 60a having an end in a slot in the rimcylinder. This permits a small amount of play before actuation of thelatch bolt, allowing closing of the door by simply pulling on the knobwithout the knob turning. A spring-pressed detent 1 I4 is utilizedselectively in either of the recesses 116 and 118 to hold the plug 60ain locking or free condition. Plug 60a has a yoke at 100a for operatingthe pivot member 940 and the latch 84a as previously described.

However the plug 600, although locking the tongue or bolt 30a by meansof a shoulder 62a as before, does not have a shoulder comparable to thatat 80 in FIGS. 1 and 2 but instead reliance is placed solely on the bolt840. However the tongue is substantially the same as before describedhaving a flat 90a to prevent jimmying and it has projections at 43a foractuation by arm 20a of the oscillating member 180 substantially thesame as previously described. The tongues 30 and 30a can be inverted forright and left hand swinging of the door to which the lock is attached.

As seen in FIG. 7, the side plates I20 and 122 are chamfered at theirupper and lower edges as at 124 and 126 so that the entire housing canbe placed in the mortise, made largely by a drill at least at the endsof the mortise rather than by necessitating the formation of a squaremortise as in the prior art. Otherwise the lock in FIGS. 6 to 10inclusive operates in a similar manner to the lock in FIGS. 1 and 2 andthe corresponding numerals correspond to those of FIGs. 6 to 10.

A further modification is shown in FIGS. 11 to 14 inclusive and ingeneral the parts here operate as in FIGS. 1 and 2, but locking bolt 84is here omitted. The parts in general are indicated by the samereference characters as before, utilizing the lower base [2. Lug 62b onthe plug 60b extends into a notch similar to the shoulder 63b and thelocking member 80b locks behind a shoulder 48b for the same purpose andreasons as explained before with respect to FIGS. 1 and 2. A cam 72bwhich is utilized to operate the plug 60b as before described and thebolt and tongue 30!; acts the same as previously. The spring at 130 hasbeen changed to some extent normally holding the tongue or bolt 3% inthe latching condition shown in FIG. 12 and moving the same to thelocked condition in FIG. 1 when the plug 60b is moved as by cam 72b aswill be clear. In this case the square opening 16b for the handle movesan actuator, see FIG. 14, indicated as at 132, and this operates to bearagainst an edge 134 on the tongue or bolt 30b to move the bolt to theright so as to open the door. Conversely it also moves the same in theother direction when the handle is turned in the opposite direction andthe member 132 bears against the surface at 136. The tongue 30b is alsocapable of being placed in either condition for right or left handopening of the door in which the mortise is located.

It will be seen that this invention provides a mortise lock of the kinddescribed having very few parts as compared to the normal lockcommercially in use at the present'time. It is substantially jimmy-proofand in some cases pick-proof especially when the element or pin 102 isutilized to lock the door from the inside.

This lock essentially has three positions. One of these positions is asshown in FIGS. 1, 6, and 11 wherein the door is not only locked butbolted; an intermediate position shown in FIG. 2 for instance and alsoin FIGS. 8 and 12 where it is latched but not locked, and the thirdposition where the respective tongues 30 and 30a are retracted in orderto allow opening of the door.

An alternate method of locking is by holding bolt 30 in retractedfositionwith the door open, actuating the thumb turn cam 00, closing thedoor, and returning bolt 30 to closed position with the door handle.This eliminates the usual locking buttons in the front plate of thelock.

1 claim:

1. A lock for securing together two structures including a latch on onestructure and a keeper on the other structure,

said latch comprising a movable tongue, a head on the tongue, a housingfor the tongue, the head of the tongue having positions extending fromsaid housing into the keeper to secure the structures, and a retractedposition on the housing to free the structures,

a movable element having positions for locking the tongue againstretraction and for freeing the tongue so that it is retractable, meansto retract the tongue when free, means to move the tongue to extendedposition,

said head having a chamfer at its extreme end and a surface portionadjacent the chamfer that is substantially parallel to the direction ofmotion of the tongue,

interengaging means between the element and tongue for locking thetongue in an extended position wherein the said surface portion of thetongue overlaps both structures,

separate means to hold the tongue in an intermediate extending positionwith the surface portion retracted, and interengaging means between theelement and said separate means actuating the latter to tongue holdingposition upon motion of the element to tongue-free position, saidelement being oscillatable and said separate means being movable duringthe oscillating motion of the element in a rectilinear direction, saidtongue including a shoulder preventing motion of the tongue past itsfull extended position, said separate means lodging forwardly of theshoulder, when the tongue is retracted to its intermediate position.

2. The lock of claim 1 including releasable means yieldingly holdingsaid oscillatable element selectively in either of its positions.

1. A lock for securing together two structures including a latch on onestructure and a keeper on the other structure, said latch comprising amovable tongue, a head on the tongue, a housing for the tongue, the headof the tongue having positions extending from said housing into thekeeper to secure the structures, and a retracted position on the housingto free the structures, a movable element having positions for lockingthe tongue against retraction and for freeing the tongue so that it isretractable, means to retract the tongue when free, means to move thetongue to extended position, said head having a chamfer at its extremeend and a surface portion adjacent the chamfer that is substantiallyparallel to the direction of motion of the tongue, interengaging meansbetween the element and tongue for locking the tongue in an extendedposition wherein the said surface portion of the tongue overlaps bothstructures, separate means to hold the tongue in an intermediateextending position with the surface portion retracted, and interengagingmeans between the element and said separate means actuating the latterto tongue holding position upon motion of the element to tongue-freeposition, said element being oscillatable and said separate means beingmovable during the oscillating motion of the element in a rectilineardirection, said tongue including a shoulder preventing motion of thetongue past its full extended position, said separate means lodgingforwardly of the shoulder, when the tongue is retracted to itsintermediate position.
 2. The lock of claim 1 including releasable meansyieldingly holding said oscillatable element selectively in either ofits positions.